Product Overview | 8663A Cycle Control Manifold
The 8663A Manifold controls pneumatic cycling valves on individual TwinBed II burners. Electrical signals from the control panel actuate the 8663A which supplies/vents compressed air to open and close cycling valves that control combustion air, exhaust, flue gas recirculation (FGR), gas, and oil. Air, exhaust, and FGR valves are almost always pneumatically operated, but fuel valves can be either electrically or pneumatically controlled. FGR and oil are not always used, as a result the 8663A is available in a number of models for different control requirements. See Bulletin 8663B if both burners in a pair are located close to each other and do not require FGR or dual-fuel control. Systems with all pneumatic cycling valves require an 8663A- -P Manifold while systems with electrically operated fuel valves use an 8663A- -E Manifold for pneumatic control of air, exhaust, and FGR. If your system is dual-fuel with an electrically operated gas and pneumatically operated oil cycling valve, use the 8663A-1-P. The manifold will be supplied with the second fuel port plugged. See the back of this bulletin for a complete listing of 8663A models. The 8663A controls a single burner, therefore two manifolds are required to control a pair of burners. Typically, the 8663A is used when each burner in a pair is mounted on opposite sides of a furnace. (For pneumatic logic arrangements, refer to Piping Schematic 1444A. For combustion system piping, refer to Piping Schematic 4343.)
8663A- Manifold
Pneumatic
Control
Logic
Valve
Designation Description
Configuration
1-E
Both burners cycling
B and C
Both burners in stop cycle Both burners in direct fire Either burner in direct fire with its twin in stop cycle
1-P
Both burners cycling
B,C, and D
Both burners in stop cycle Both burners in direct fire Either burner in direct fire with its twin in stop cycle
2-E
Both burners cycling
A,B, and C
Both burners in stop cycle Both burners in direct fire Either burner in direct fire with its twin in stop cycle Both burners using FGR
2-P
Both burners cycling
A,B,C, and D
Both burners in stop cycle Both burners in direct fire Either burner in direct fire with its twin in stop cycle Both burners using FGR
3-P
Both burners cycling
B,C,D, and E
Both burners in stop cycle Both burners in direct fire Either burner in direct fire with its twin in stop cycle Fuel select for dual-fuel
4-P
Both burners cycling
A,B,C,D, and E
Both burners in stop cycle Both burners in direct fire Either burner in direct fire with its twin in stop cycle Fuel select for dual-fuel Both burners using FGR
Bulletin 8663A Page 2
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